The Collaborative International Dictionary
Defedation
Defedation \Def`e*da"tion\, n. [L. defoedare, defoedatum, to defile; de- + foedare to foul, foedus foul.] The act of making foul; pollution. [Obs.]
Wiktionary
defedation
n. 1 Process of polluting or making filthy, act of causing dirtiness. 2 pollution